For the family Euglenophyceae, Euglena spp, Cyptoglena spp, Phacus pleuroneites and Trachelomonas spp were more abundant species across the sampling stations; while stations 5, 4 and 6 recorded the highest species composition belonging to Euglenophyceae in the two seasons, while station recorded the least (2 & 3) abundance (Table 1).

The correlation values between different classes of phytoplankton and some physico-chemical parameters showed inverse relationship between Bacillariophyceae, Chlorophyceae, Euglenophyceae and xanthophyceae with phosphate-phosphorus (Table 4).

Four taxonomic classes were identified with 29 taxon for farm 1, represented by the semi-intensive cultivation, being seven taxa for Cyanophyceae, 18 taxon for Diatomophyceae, two for Dynophyceae and one for Euglenophyceae.

In 2001 and 2002, heterotrophic and potentially mixotrophic algae (Cryptophyceae, Dinophyceae, Chrysophyceae, Euglenophyceae, Choano- and Zooflagellata, unidentified heterotrophic flagellates) attained the lowest relative biomass (42-43% of total phytoplankton) in the reference lake Upper Kuito, where their absolute biomass was 34-95% of those in the impacted lakes.

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